Displaying the invoked script name

Review the short definitions of the shell syntax, parameters, permissions, and control flow involved.

$0

The name used to invoke the shell or script.

$1

The first positional argument in the current context.

$#

The number of positional parameters in the current context.

$@

The positional arguments expanded in their original order.

Positional parameter

A special parameter holding a script or function argument by position.